Subaqueous illumination of swimming pools



une 1o, 1930.`

' Filed Nov. 1s. 1928 11- snefssmep 8 .mv ENTOR. gjfzflarzrzvoraezzyATTORNEY leakage:

Itis another object-of my invention to pro- Pa-issie ,Ju-ae io, i930 lUNITED STA-TES- PAT-enrforricn Jonirnaancrs'aoonanhr, or aniimiwron,CONNECTICUT sii-macnews :iluminacion or fswnritmo :eoora .eppiiaioiinie-d november 1aI` lisas. 'serial no. '$20,237.

This invention relates to illuminating vide suclraii illuminating meansfor swimining pnols. i'rr3vhiclr.theiight source is located above thewater level, thus-eliminating all danger of electrical shock totheswimmers which might be caused by the short cirsource were submerged.

of the invention to provide a subaqneous light source at a suitabledepth below the water l' level enclosed within a transparent glass tu-bewhich etectually insulates the light source and revcnts charging of thewater vvith electric current in the event oa short circuit.

Itis a further object of the invention to provide simple and inexpensivemeans for conducting the light rays anddiiiusing the same into the-bod'y of water over a comparatively great area, such means in certainembodiments of the invention including means whereby 'the -effect ofmoving light rays in.

the various colors of the spectrum may be produced,

It is also an additional object of the invention in a further embodimentthereof to provide a plurality of light reti-acting prisms in.combination with power operated means for continuou'sy orintermittently projecting the colors o f the spectrum emanating fromsaid prisms into thejivater conta-ined in the pool.

It is a. further general object of the inven-l tion to provide simpleand reliable means whereby the light dit using means may be ad- .quentlyincorporated in the s-ubjoincd claims.

cuiting of current supply wires, the light '-so'rce .and means wherebythe lightrays jus'ted vertically to various positions between the ivaterlevel and the floor of the pool.

XV 1th the above and other objects in View, the inventionconsists in theimproved illumina-ting means for swimming pool-s and in 55 -the form',construction and relative arrangement of the various arts thereof aswill be hereinafter more f ul y described, illustrated in theaccompanying drawinc" and subse- In the drawings, wherein I haveillustrated several simple and practical embodiments of my invention,and' in -which similar reference characters designate correspondingparts throughout the several vie-ws,`

Figure 1 is avertial sectional -view through f one side wall of aswimming pool showing one embodiment of the invention in which a.suhziqiieous light sou rceis employed together with suitable means-for'in'sulating' the' same and for also diiiising the light raysintothe ivater of the pool;

2 is a horizontal section tak'e'n' on the lineQf-2ofFi .1; It is alsoafeature of another embodiment Fig. 3 isV a similar s ect'ionalvv-iew'showing 75 a slightly modified form of the glass insulating tube within`which .the light source is enclosed; l

Fioz' is a fragmentary elevation of one of the side 'walls of the poolhavng'my"`inven-` tion applied thereto; I

Figs. ,5, 6 and 7 are .horizontal sectional views showing .severa-ldifferent alternative forms of the enclosing tube for the lightemanating therefrom may be reflected, reracted and difused through thepool water ;A Fifn8 isa. vertical sectional view through one -side-wallof a poolshowinganother em. bocliment of the invention appliedlthereto;l

Fig 9 is a horizontal sectional view taken on the line 9--9 ofFig .8; ig v Fig. 10 is a detail vertical sectionithrouffh the lower end of thelight conducting tuzhe showing the'mounting and arrangement of 95 thequartz crystal" f'.

Fles. 11, 12 and 13 are detail vertical seo tional views showing oneform of the quartz c stal which ma be used;

igs. 14, 15-an 16'are rontelevations of loo s'rtiling andprovided atspaced intervals with v the device as vshoi'vn in Figs. 11, 12 and 13respectively;

Fig-L 17 is an interior side elevation of the ool wall' showing thevembodiment illustrated in Fi". 8, parts of .the light. deflectiug members being broken away;

Fig. 18 is a fragmentary'vertical sectional view through the wall or thepool showing another form of the light diffusing quartz crystal;

Fig. 19 is a diametrical sectional view through the quartz crystalshow-n in Fig. 18;

Fig'. 2O is a sectional view taken on the line 20-20 of Fig. 19;

Fig. -21 is a front side 'elevation of the quartz crystal' shown in Fig.19;

Fig. 22 is a vertical'seetional view through one side of the p'oolstructure 'showing still another embodiment of the invention;

Fi'g. 23 is'a similar view illustrating an alternative form of thedevice;

Fig. 24 is a detail vertical section illustrating a modification oftheconstruction shown in Figs. 18 and 19;' A

Fig. 25 is a similar sectional View showing the form of the device forlprojecting a concentlrated beam .or pencil of light into the Figs. 26,27, 28 and 29 are detail views of various forms of rotatable lightdiilusing-c'ontrol discs ;1.

Fig.,30 is a detail plan view showing .one form of the light conductingquartz and arrangement of the refracting prisms;

Fig. 31 is an edge view thereof;

Fig. 32 is a. fragmentary vertical .sectional view of one side wall of'the swimming pool showing the mountingand arrangement of one of therotatable light control discs in combination with'the quartz crystal andrefrncting prisms;

Fig. 33 is an interior side elevation of the p ool provided. with thelatter form ofthev dej.

vice;

Fig. 34 is a. view similar to Fig. 1 showing n still 4furtheralternative embodiment of the invention;

Fig. 3'5 is an interior side-elevation similar to Fig. 33 showing thelatter modification;

Figs; 36 and 37 are views similar to Figs. 32 and 33 showing stillanother formof' the invention;

Fig. 3S is a det-ail front eleva-tion of the quartz crystal and lightrefracting prisms as shown in Figs. 32 and 36, and

Figs; 39 and 40' are views similar to Figs.' 32- and 33 showing anotheralternative embodiment of the device.

'In the various embodiments of my in\-er-.-A tion which I have selectedfor purposes o illustration, I have shown the same as applied to a poolstructure, the side and end walls of which are built up of terra cottaand enameled brick, or brick faced with enameled vertically extendingchambers, de rcssions or pockets indicatedat 5. 'These si( e and en.walls of the pool throughout the area thereof,

as well as the floor of the ool structure throughout its area are baciedby heavy water proofing fabric which is 4also carried around thedepressions or pockets 5 as indi- -cated at 6. The upper ends of thevertical of the pool are faced with special shapesl of the terra cottaor enameled tile but are otherwise open to the flow of water and coveredwith the transparent glass plates 9 which are. vertically slidable4 insuitable guide ways formed in the tile and the gutter and life railtiles 7. However-` itis not necessary to malte these transparentclosures for the pockets or chambers 5 water tight, and the water fromthe pool may freely enter and circulate within these chambers around theedgesof the glass plates, which need not necessarily extend to thebottom of the pool.

In the particular embodiment of the invention shown in Fig. 1 of thedrawings, at the upper end of each of the vertically extending chambersor pocket-s 5, atile 7 of spe cial form is interposed in the line of thegutter and capicourse tile 7 and 8,'said tile 7 interrupting the gutterchannel, thebase'walls of the gutter sections sloping downwardly inopposite directions from said tile to-a suitable outlet as seen in Fig.4 of the drawings.

The tile 7 is provided with acavity 10 thercin opening upon the uperijace of said tile and an Opening 1'1 o ,relatively small diameter isformed through the tile and com-- municates with the base of saidcavity. Through this opening anl elongated glass tube 12 is inserteddownwardly into the chamber 5. This tube may be of any desired length,but preferably is of'such length that its low er closed end ispositioned substantially midway between the maximum water level of thepool and the bottom or floor thereof.

The cavity 10 is'adapted to receive a metal sleeve 13 which bearsupona'anve formed on the upper endgo the glass tube 11 and holds thesame tightly against the yannular shoulder surrounding the upper end ofthe opening 11. The u per end. of this sleeve is closed by a remova leca 14.' which is flush f with the upper aceoft e tile 'I'. By theremoval of this cap, access maybe had *for the purpose of feeding thecurrent conducting wires 15 for an electric lam 16- of high wattage,downwardly into the g ass tube 12. These wires may be extended laterallyy 1,763,388 I a guide in the of the sleeve .13

and an o g in the tile 7 beneath the floor. .tile which surrounds the.pool 'and connected by means of a plug with a conveniently lol catedsurface outlet.

'With the arrangement above described, it will be seen that the interioro'f the tube 12 --being thoroughlywater tight, the lamp 16 is therebyprotected. and the possibility of .the

19 water-shorbcircuiting the current so that the water would becomecharged, -is obviated. The lamp being located in the lower-end of thetube 12 provides directsubaqueous il;

Y v lumination of the bodyof water containedv 15` in thepool, the lightrays being diffused through the wall of the tube 12 and plate- 9.

If desired. the latter may be colored. Also,A

-in order to intensify the concentration of light rays upon the poolwater, the inner sur 2`0 face of the rear part of the wall ofthe tube 12may be sil-vered or otherwise provided with a suitable light reflectingmeans.

In Fig. 3 of the drawings, I have illustrated another form of the tube12 whi'chma'y'be provided'with sections each having a plurality oflongitudinally extending plane surfaces 17 and with the Surfaces of onesection being positioned at an angle with relation to the-contiguousplane surfaces of the adjacent section of the tube. This form of thetube may be 'produced in glass to -refract the light- 'rays 'emanatingfrom the lamp 16 and diffuse the same into the pool water. In suchcasejt will be understood that the front side of the chamber or pocket 5is covered by a colored or uncolored transparent plate 9.

In Fig. 5 ofthe drawings, I have shown` I the tube 12' enclosed withinan outer tube 18 'of glass, the inner tube having thel rear side n ofits wall silvered as indicated at 19. The outer tube 18; provides aprotecting'casing for light may' pass may be substituted for the plates9.

In Fig. 6 of the drawings,` I show another form ofv the enclosin andprotecting .tube for thelamp bulb in willich said tube includes a. rearsection 20 of relatively large diameter 55 having: an inner vrelieetingsurface 21, and

the forward section 22 of. relatively small diameter. To the outer sideof this section 22 of the tube, a body of glass 23 is suitably secured.The light raysdirectly' assing from e0 the lamp and those which are reected by the surface21 through the glass 23 are projected along radiallines through the pool lwater.

In this case likewise, the f-ront plates 9 for the chambers or pockets 5may be omitted.-

Fig. 7 vshows another alternative form of l a c the en in' which areemeis entirely farmed of light mfracting .glass and is with oppositesections caressing in thick-A '116,88 fromv the center of each ctlon tothe, 2 v 'i opposite sides of the tube.

In :he construction illustrated in Fig. e of j l the drawings, insteado'f employing the glass tube 1-2, n metal tube 25 extends downwardl fif;

into the chamber or pocket 5 and the hig pqwered electric lamp 2s .issnif-.ably mounted 71;* 1n the upper `end of this tube to throw theYlight rays downwardly through the tube. If. desired, the tube wall maybe. provided with-a Vreflecting surface, such as whlte enamel, and asuitable form of reliector may "also .8 be directly associated with thelamp 26 so as y to intensify the light raysl A'second 'relatively shorttube 27 is telescoplcally connected` orV associated with the lower endof .the tube 25 either interiorlyor 8s e'xteriorly thereof. .In thepresent instance, I

. have shown the tube 27 disposed within the end of the tube 25 andopen' at its'upp'er end vso that the lightrays may have an -unobstructed passage therethrough. To this upf om per end of the tube 27 anannular collar or gasket 28 is lixed and has water tight slidingengagement with the wall of the tube 25.

In the lower end of the tube 25 one fend of Provided. r

thecylindrical shank 30 of a light 'conductnsnf-T' ing quartzcrystalbody 29 i s suitably secured. The body 29 vof the quartz at the otherend of the shank 30 as shown in Figs. 8 to 10 of the drawings, `is ofsem-ispheric'al form. Preferably, this body -is inthe form of a loocupped disc having a rearwardly facing beveled perimeter, and the lightrays passing through the quartz bod-yare projected :from i i .theperimeter thereof vagainst reversely angled faces 32 of the verticallypsitijoned -105 light dclectng quartz members 31 which are .suitablyconnected with the lower end of Athetube 27 carrying the quartz crystal.The light beams are thus deflected' :11nd projected outwardly atdiverging angles'thrugh' the 110 glass plate 9 into the pool.

The tube 27 is of 'such length 'as to permit I of a certain amount ofvertical adjustment of the same together with the crystal 29 andthedeflecting members 31 relative to the tube 115 2'5. For this purpose,I may rovide any conventional mechanical fm'eans, utas herein shown, onesimple device for this p urpc'isev may consist of the rod 33 extendingdown wardly into the chamber 5 through a suitable 120 bearing provided'on the wall of the tube '1 0.' The lcwerend portion of this rod hasthreaded engagement in s. bracket arm 34 suitably fixed to thelower endof the tube 27- externally of the tube 25. Thus, by rotating this rod,the 15.13;,

light conducting quartz together with the -deflecting members 30 may bemoved to various vertical positions Abetween thelower end of the tube 25and the pool floor.

In Figs. 11 to 16 of the drawings,I` have 13 A... o N' sli'" -..idifferent forms of the quartz 'members which may be employed withoutusing the deilecting members 31. In Fig. 11 the quartz member terminatesat its lowerend in a, forwardly projecting hollow cone which 'presents acomparatively wide annular end face adjacent tothe glass 9. Thus asindicated by the dotted lines in this figure, the light beam i'sprojected through the glass crystal and into the bod of water in'thepool in the form of a. widely flaring comb of variegated light ra s.

In Fig. 12, the quar `z member is shown in the form of a hollow cup 3Shaving its concave side opposed to the "lass 9 so that in this case, asindicated by t e dotted lines in Fig. 11, a cylindrical tapering 'beamof light will be projected into the water in the pool.

In Fig. 13, the quartz member is shown in the form of a concavo-convexsector 37-havin g a forwardly presented semi-circular edge from whichthe light beam is projected into the pool.

In Figs. 18 to 21 inclusive, there is illus-= trated another form of thequart-z member in which said member is of the sectional fonn shown inFig. 19 and consists of a plate or disc 38 formed on the forwardlyprojecting end of the cylindrical shank, said disc having its -wallreversely curved to provide an annu lar edge face 39 disposed at asuit-able angle and from which a cone shaped beam of light willbe'directly projected outwardly through 'the glass plate 9 into the pool.

In the form of the invention shown in Fig. 22, the quartz member carriesa suitable casing or housing 40 having its front side open and withinwhich there 1s arranged diametricallynof said front side of the housing,a lightA deiiecting member 41 of triangular 'shape in cross section. Thelight rays from the `uartz 42am projected against the reverse y angledfaces of .the quartz defiecting member 4land by the same -are deflectedagainst an annular'or 'ring shaped light delecting member 43 which issecured within Y vthe housing or casino' 40. Thus in this case acylindrical beam' o? light will be projected outwardly into the pow..

In Fig. 23 oft-he drawings, there is directly secured upon the angularend of the quartz cylindrical shank 42' a glass4 prism 44 from thereversely angled faces of which two beams of light in variegated colorsare angularly projected upwardly and downwardly respectively, into thepool.

In Fig. 24', I have shown an alternative form of the .device 4whereinthe quartz light conducting and distributing body 38' is formedseparately from ,the quartz shank 42l and providedat its rearside with asuitably formed socket 4to receive theout-turned e Aend of said shank. Aprism 45 vis interposed between said'shanlcand the quartz bod 38..

Thus as the light rays leave the sha 42* l l. l o

they are broken up into t they pass through the 45 by which 'e variouscolors'of the spectrum, and such colored light raya finally projectedfrom the edge of the quartz member 38 in the form of a' variegatedcylin- A drical light beam into the pool.

In Fig. 25 of the drawings, I have shown the quartz member merely in the'forml of the cylindrical shank 42 having its lower endforwardly bent-orturned. A uertz member of this form is used where it is esired merely toProjecta light beam ir. the form of a'cylin- -drical pencil ofrelatively small diameter into the pool.

In a further embodiment-of my invention, I also rovide means 'forintermittenti nterrupting the .projection of4 the light eam into thepool water and which provides the illusion of a movin light Abeam whichmay be either white, or 1n the various colors of the spectrum. In orderto secure this result,

erably use a quartz ,member of the kind shownl in Fig. 30 in which thelight conductingI body of said member is provided with the for ed ordivcrging branches 46 havingv plane end faces upon each of which ismounted a sinffle glass prism 47 ,acting by refraction t( proc uce thevarious colors of the spectrum. The rotatable disc is journalled upon anaxis'centrally fixed with relation to the quartz-.body and ro tation ina. vertical plane closely adjacent to the glass prisms 47.

The rotating disc 48 as seen in Fig. 26 of the drawings is provided withtwo eccentric slots 49 therein which are arranged in opposed relationand are adapted to coo rate with the radially positioned prisms 4 .v Inthe arrangement shown, in -the rotation of the disc, it will be seenthat the corresponding inner and outer ends of these slots pass over theinner and outer ends of the respective prisms 47 at the same time, thuspermitting the same or contrasting color of the spectrum from theprismsto pass through said slots and be projected into t-he pool. Owingto the ccccntricity of these s lots, the color of the li ghtr beams willlie-constantly changingwithout interruption .until lthe outer ends ofthe slots move over the outer ends of the prisms, at

' provided with two series of'spaced openin 51, each seriesbeinc'arranffed on an eccentric curve, so that in this case the samevariations in 'color will be obtained, but the projection ofthe lightbeams will be interrupted by the openings of'small diameter 'andadditional .-"openings of greater diameter; Thus, in this case u s-eacliseries of said openings passes over one of the prisms, a lu'rality ofbeams of light of relatively di erent'size and colors will be projectedat the same time.'

` In Fig. 29 the disc 54 is .provided withthe radially spaced :series of.openings 55 and in addition thereto with the slits 56. As shown,

these slits are curved. Hour-ever, they might' also be of' othergeometrical forms land in other arrangements than that -shown in thedrawings so as to produce a novel and attractive illusion of movinglight beams of varieg'nted colors in the pool water. n

In the arrangement shown. in Figs. 32 and 33 of the drawings, I showanother form of' the rotating disc 57 vrhich may be provide-d with anyone ofthe above referred to means beams, or as shown in said tigures,this oise of closely 'spaced openings as indicated at 58.

This. disc 57 in the illustrated construction isprovided onit'speripliery with spaced radially projecting venes o r blades 59against which waterunder pressure is delivered from the pipe 60 intangential relation to the disc 57- so that said disc will be rotated inthe manner of the common waterwheel. The pipe 60 may be supplied fromthe pump which is nsedin the retiltra-tion system of the 'pool forcirculating Ythe pool water through s; suitable filter, or said lpipemay be directly supplied with Water from a suitable pressure line. Therelatively small :excess of water supplied to the pool through the ipenould merely replace the water whic splashes over into the pool guttersin the movements of the bat-hers.

In the arrangement shown in Fig. 32 the quartz body may be provided withadditional' radiating arms similar to the .arms 46 in Fig. 30 andpositioned at right angles thereto, or` this quartz body 6l may consistsof a hemisphere having. a dat face opposed to the glass 9. Thus.provision is obtained upon either form of the quartz body for theattachment cf the radiating glass prisms 69. arranged at a 90 angle-with respect to each other sc that -in'eaci rotation of the disc, agreater number of light beams will be projected into the pool and theinterruptions of these light beams will more frequent]l occur. ,stoodthat the ht rays from the high powered electric biliA are conductedsubstantial-4 ly' at their original intensity throuvh the quartz memberand are received b the sev- A eral prisms 62 and broken upinto t e.various colors-o the spectrum.

'between the i for interrupting the projection of the li'vlitV 'ings Itis of course, undern rigs' aliadas of the drawings, I .have

4shownanother form ofthe rotating disc which is composed of a pluralityof angularly related sections 63, eachfsection prvid-ing a radiallyextending impingement surof these sections is provided witha singleopening 64 therein, said openings being spaced at relatively differentdistances from' the center of rotation oi the disc. Thus, in this case,it will .be apparent that theelect of the moving light beams isalsoproduced with a. v'somewhatlonger period of interruption. However,as indicated in dotted lines in Fig. 35, I may also provideadditionalprisms on the end face ofthe quartz body' ys o that the prisms will bespaced apart at a 45 angle. In Figs. 36 and 37, 1 have' shown stillanother embodiment of the invention wherein a rotating glass disc 65 isemployed.4 To the iront surface of this glass disc Aa Aplurality ofradially disposed reflecting members 66 aresuitahly secured.. The glassbetween .adjacent reflecting members may have differently coloredsections as indicated at 5',oron e ofsaid sections may iidesired; berendered opaque to interrupt the projectionxofthe-light beams. 1n thiscase; the dise is rotated in the Same manner as 'illust-rated in Fig. 33of theldravv-v 111 Figs. 39 and 40 of the drawings, the rotating disc 67is provided upon its front si`ir-l face with a plurality of parallelribs or shoulders 67 so that inthe rotation'of the disct l'ie fullyunderstood. The' several construe-mons referred to are relatively simplein 'thoform and arrangement of the severalelements and can heea'sily-mounted'iand arranged in operative positionlin the'bnilding of the ooolat a nominal additional cost. It will be seen that in .each case, I.provide a means 'for very ef- 'l feeiively and attrmztivelyilluminating the the pool, and at the same time have entirely avoidedthe necessity of penetratingthe Water proof backing sheet 6 .of the poolstructure'so that there will be no-liability'of -the leakage of the poolwater therethrough.

In addition tothe several embodiments-of l'the invention referred to,'it is also possible that similar results might be obtained inthe.

use of various other alternative mechanical forms of the invention, andI therefore, re-

serve the privilege of resorting to all such i legitimate changestherein as' may be fairly embodied within the spirit and scopo of theinvention as claimed.

l u o iso I claim: A

1. A swimming pool structure having .a chamber in its vertical wall,opening into the pool and a transparent plate covering said .open sideof the chamber, sub-surface illuminati-n0 means for the pool including asource of artificial light located abovesaid chamber, meansar'ran edwithin the chamber for projecting a li it beam through said. transparentcover iat@ into the body of water contained in t ,1e pool, and means forconducting thelight from said light source to said beam projectingmeans.

2. L swimming pool structure having its wall backed by water proofingmaterial, one of Athe vertical walls of the pool having a chamberopening into the pool, a transparent cover plate for said open side ofthe chamber, and sub-surface illuminating means for the pool includingmeans for projecting a light beam through said transparent cover plateinto the pool, and means for conductiner i light from an artificiallight source to sai beam projecting means, an'd said illuminating meansbeing mounted and arranged cntirely at the inner side of said waterproof backing for the pool walls.

3. A' swimming pool structure having its walls backed b water proofingmaterial, and

one of the vertical walls ofthe pool provided with a chamber openinginto the pool and a transparent cover plate for said open side of thechamber, sub-surface illuminating means including means for defiectingand diffusing light through said trans arent cover platel into thepool'arran ed'wit in said chamber, a source of artificia light locatedabove the maximum water level of the pool', and means for conductinnrthe light from said light source to the .eflecting and diffusing meansextendin g downwardly into said chamber entirely within the water proofAbacking for the pool Walls.- l

4. A swimming pool structure having its walls backed by waterproofingmaterialj-and provided with a chamber in one of-its verticalwalls opening into the pool and a transparent cover plate for the openside of said chamber, subsurface illuminating means for thepoolincluding an artificial. 'lig-ht source located' external-ly of saidchamber, a lnrality of light retract-ing prisms arrange with in saidchamber, means positioned inwardly of the water proof backing fortheLpool walls and eit'endinvl into said-c iamber to conduct ligh fromthetlight source to said prisms, and

vmeans for diffusing the light rays from said.

into the pool.1

5. A swimming pool structure having its walls backed by water proofingmaterial and provided with a. chamber in one of its vertical wallsopening into the pool and a transparent cover plate for the open side ofsaid chamber, subsurface illuminating means for risms through saidtransparent cover plate use P001 standing anar-assai lights-@afee 10gcated externally ofsaid chamber, a plurality of light refractin'g prismsarranged within said chamber, means ositioned inwardly of the waterproof bucking for the pool walls and extending into said chamber toconduct chamber, a sub-surface illuminating meansl for the poolincluding an artificial light source located externally of said chamber,a plurality of light rcfr'acting prisms arranged within said chamber,means positioned 'inwardly o f the water proof backing for the poolwalls and extending into said chamber to conduct light from the lightsource to said prisms, and a power operated rotatable disc associatedwith said prisms and provided with openings progressively moving acrossthe prisms lengthwise thereof in the rotation of the disc to vary theangles of projection of the light rays from the prisms through saidtransparent cover plate into the pool.

7. A swimming pool structure having itsi walls hacked by water proofingmaterial and provided with achambcrinpne of its verticalwalls'eninginto' the poni and a transparent cover plate for the openside lof said chamber, sub-surface illuminating means for the poolincluding an artificial light source located externallyof said chamber,alurality of light refraeting prisms arrange with'- Vin said chamber,means positioned inwardly ofthe water proof backing for the pool wallsand'extending into said chamber to conduct light from the lightsource-to said prisms, an opaque disc rotatably mounted between theprisms and said transparent cover plate and provided with opposed'eccentric slots progressively moving across the prisms lengthwisethereof in the rotation of the disc t o cause a movement of the lightbeams projected rom therespective prisms through said slots into thepool, and means for rotating said disc.

8. A swimming pool structure -having'its wall backed by water proofingmaterial and one of the verticalwalls thereof provided with a chamberopening 'into the pool and n." transparent-cover plate for said openside of the chamber, an artificial light source 'external to saidchamber, and sub-surface illuminating. means for the pool inclndingaquartz body of predetermined geometrical form for projecting a lightbeam of the desired shape through said transparent cover plate into theniet;

los" i im. f

iis

pool, and means 'ii'.lmll",r positioned within sandl water proof backingfor conducting light. from said artificial light .source to said quartzbody..

9. A swimming pool structure having its wall hacked b v water proofingmaterial and one of the vertical walls thereof provided with a chamberopening int'o the pool and a transparent covcrplate for saidopen side ofthe chalnheiuan artificial light sourcerxte'rnnl to said chamber,and'sub-s-'urface illuminatinff means for the ool including a uartz bodyof predetermined geometrical orm for project-ing a light beam of the de,sired' shape through said transparent cover plate into the pool, meanswholly positioned within said water proof backing for conducting liehtfrom said artificial liffht source to one of the vertical' wallsthereofprovided said quartz body, and means for iertically adjustingsaid quartz body in said chamber lrelative tosaidlight conducting means.

10. A Vswimmingpool structure havingits Wall hacked by water proofingmaterial and with a chamber opening into the pool and a transparentcover plate for said open side of the chamber, an artificial lightsource external to said chamber, and sub-surface illumi'nating means forthe pool including a quartz body of predetermined geometrical form forprojecting a light beam of the desired shape through said transparentcover plate into the pool, one or more light', refractiving prismsassociated with said quartz body, and means wholly positioned withinsaid 'water proof backing for conducting light fro-m said artificiallight source to said quartz bodv.

11. A swimming pool structure having 'its 13. V-sWiminin-p; poolstructure having its walls -baclred by tra tcr-prooting material, one oftl.e "crtical Walls of Athe pool having a chamber-therein. and atransparent plate covv chamber therein opening -i-nto the pool andreceiving water tlnrefromsuhsurface lllumi- A n'ati'ng means forthe poolarmnged entirely at the inner side of the water-proof backing for thepool wall, said means including a li ght source, and means-arrangedwithin said cham@ ber receiving light from' said source'and embodyinglight re f rac-ting prisms for disseminati-ng light in they formof a`plurality of light beams pi-ojeetcd over a comparatively extensive areainto the pool water.

In testimony that I claim' the forcer-ing as my invention, Ihave signedmy name 'ereto.

walls backed by water-proofing material, one V of the vertical' -:illsof the pool having' a chamber therein and a t ransparcnt plate coveringthe open side vof 'said chamber at. the interior of the pool, andsubsurface illumi nating means for thepool arranged entirely at theinner side of the water-proof backing for the pool wall, said meansincluding alight source, and means located within vsaid chamber forprojecting light, rays emanating from said source laterally through saidtransparent plate into the pool water.

12. A suilii'miug p Ool struct-ure having its Walls backed by\-'ate.rproofing material,- one o f the vertical walls of the poolhaving a chamber therein and aitransparent plate covering the open sideofsaid-chamberat the interior of the pool, and subsurface illuminating.means for the pool arrangiedentirely at.

the inner side of the waterproof backing for the pool arall, said iueansincluding .a iight source, and means arranged within said ehamberfor'difl'using light rays emanating from -said source and projecting thesame laterally .through said transparent plate over a comparati relyextensive area into the pool water.

JOHN FRANCIS Boon-AEM,

